diff options
Diffstat (limited to 'fs/btrfs/raid56.c')
| -rw-r--r-- | fs/btrfs/raid56.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/fs/btrfs/raid56.c b/fs/btrfs/raid56.c index d016d4a79864..af6a776fa18c 100644 --- a/fs/btrfs/raid56.c +++ b/fs/btrfs/raid56.c @@ -2161,11 +2161,21 @@ int raid56_parity_recover(struct btrfs_root *root, struct bio *bio, } /* - * reconstruct from the q stripe if they are - * asking for mirror 3 + * Loop retry: + * for 'mirror == 2', reconstruct from all other stripes. + * for 'mirror_num > 2', select a stripe to fail on every retry. */ - if (mirror_num == 3) - rbio->failb = rbio->real_stripes - 2; + if (mirror_num > 2) { + /* + * 'mirror == 3' is to fail the p stripe and + * reconstruct from the q stripe. 'mirror > 3' is to + * fail a data stripe and reconstruct from p+q stripe. + */ + rbio->failb = rbio->real_stripes - (mirror_num - 1); + ASSERT(rbio->failb > 0); + if (rbio->failb <= rbio->faila) + rbio->failb--; + } ret = lock_stripe_add(rbio); |